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36. What external ECG signal will interfere?

In Electronic Infomation Category: 3 | on September 30,2011

First, that the generation of ECG: heart rate at all times in accordance with a certain beat and 36 datasheet and rhythm, the heart with each beat, first excited to produce electricity, electric excitement began in the sinus node, and 36 price and along the cardiac conduction system under the special pass, has excited the atrium and 36 suppliers and ventricle, the systolic implementation of pump function. This has ordered the spread of excitability can be transmitted by human tissue surface, resulting in a series of potential changes, ECG was recorded form. (ECG reflects the heart of exciting generation, transmission and recovery process of bio-electrical changes in the heart various parts of the myocardial cells have many potential changes occurred in overall performance, not due to mechanical contraction of the heart produced.) Precisely because ECG signal itself is very weak, so the detection is vulnerable to outside interference, such interference include:

(1) EMG interference. When the ECG electrode paste under the muscle contraction will result in EMG, ECG signal will guanidine interference, and that such interference with the ECG signal with the same spectral bandwidth, can not simply be eliminated with the filter.

(2) movement interference. The patients body movement will cause changes in the ECG signal, its impact, depending on the magnitude and frequency of this movement size. If the bandwidth of the ECG amplifier, the monitor is very difficult to overcome.

(3) electrode contact with interference. ECG amplifier signals from the body to any interference on the channel will cause a strong noise, may cause blurred ECG waveform, such as electrode noise is often caused by poor contact with the skin. Prevent such interference, mainly from the use of methods to overcome the instruments reliable grounding, not only for good anti-interference, but also protect the patient and operator safety.

(4) electrosurgical interference. Surgical procedures using high-frequency electric knife, added to the bodys electrical energy generated is far greater than the amplitude of ECG signals, and frequency components is very rich, so that the ECG amplifier saturation, and can not be observed normal ECG waveform. Monitor the function of anti-high-frequency electric knife is a knife in the high-frequency power after the abolition of Ss, the monitor can quickly return to normal monitoring status.

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